People who have had multiple partners are more at risk from sexually transmitted diseases.有多个性伴侣的人得性传播疾病的风险更大。Sexually transmitted diseases have long been implicated in infertility.性传播疾病很早就被认为是不育的一个原因。The yearbook also noted a sharp drop in reported cases of sexually transmitted disease.年鉴同时指出，性传播疾病报告病例数显著下降。